Huawei Ascend G520-0000: USB Debugging greyed out

Tried as I might, USB developer options were greyed out on this domestic China smartphone. I searched everywhere on the interwebs and found nothing. Here is my solution.

Plugged usb out, developer options still greyed out. About phone, tapped build number 7 times, developer options still greyed out, nothing.

Then I searched generically for a clue, and found a StackOverflow post at the very end, by sevensevens.

FYI My Motorola Xyboard had an “Off” icon at the top of developer options. Once I tapped that it worked.

answered Dec 24 ’13 at 19:40
sevensevens

This did the trick. At the top of the developer options screen, to the right of the “Developer Options” label, is a toggle set to “OFF”, swipe to “ON”, and your greyed out developer options come to life. It should not be this hard.

Adding Google apps to a Huawei Ascend G520-0000: Gives you a web page on Huawei’s site to unlock the bootloader. It did not work for me, so I had to send an email.

Prod ID #: You need to phone “*#*#1357946#*#*” and the prod ID will appear.
IMEI: remove back cover, battery, it’s on the inside.
SN: same as IMEI, it needsto be in capitals and 14 digits long

So I’m trying to get this bootloader unlocked so I can run the Google Play Store, and you need to do this on the Huawei site. I did their online form and got an error. They suggested I use their email form to contact them. Here is their response:

Dear User,
Huawei Customer Service is pleased to be at your service, sorry for bringing you the trouble, if you want to unlock your phone, you should meet the condition as follows:
1.Please register your Huawei ID in our official website http://huawei.com/en/ on your phone.
2.Log in your Huawei ID on your phone for 14 consecutive days .
3.Each Huawei ID should not apply for the unlock code more than twice within half years. If you meet the information, please go to http://emui.huawei.com/en/ and click the ‘download’ button to login your Huawei ID other than any other third party ID to apply for the unlock code. Please contact us by mail or local service hotline as follows if error message appears.
TEL: http://consumer.huawei.com/en/contact-us/index.htm?tag=hotline
Mail: http://consumer.huawei.com/en/contact-us/index.htm?tag=email
Please submit your mobile model, SN, IMEI/MEID and error message in your e-mail. We also need to know that your phone is rooted, it can be out of the best working state and part of functions may not be able to work normally. In additon, the system is vulnerable to be invaded by viruses once your phone is permitted to unlock. What’s more, for the lacking of fully tested, the third party software will not be compatible with your phone. Unlocking will bring unexpected negative impacts and the device will be not normal, and can not be restored, Huawei after-sales service office will not provide warranty service for your rooted phone, and you may bear the cost. So we strongly advise you to think it twice.
If you have any other problem, please send your feedback to us. We will be at your service to help you solve your problems.
Once again thank you for contacting Huawei device.
Best Regards.
Huawei Device Customer Care Team (3207)

What a hassle. Does this mean that I need to login to their site every day for 14 days?